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It depends on what the "hidden" class does. I guess you have defined it with "display: none". In that case the behaviour is not unexpected. "display: none" removes the title from the flow, so the anchor is nowhere.
I'm not sure what the spec says about this, and it seems other renderers can access anchors with "display:none", but I wouldn't rely on that.
Since the title is probably only being used to create an automatic TOC, you can remove it once the TOC has been created (and put the id in some other element). Or you can try to make sure the title is not displayed, without using "display: none" (try "visibility: hidden", plus removing all height and margins, but this is not a required property in ePub 2 renderers).
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